The legacy Discovery Tool (specifically version ) is a staple in many tech toolkits because of its lightweight nature, but it was built for an older era of Java. On modern Windows 10 systems, getting it to run can be a headache.
: Always check that your Windows Firewall is not blocking the tool. It requires permission to listen for incoming broadcast packets. ubnt discovery tool v251 and java on windows 10 updated
Download a portable, older version of Java and modify the ubnt-discovery.bat file to point directly to that specific java.exe instead of the system-wide installed version. The legacy Discovery Tool (specifically version ) is